Principal Software Engineer

Summary

Join OpenX, a company focused on maximizing the economic potential of digital media, as a Principal Engineer. Lead large-scale integrations and enhance the scalability and performance of our cloud-based platform. You will design and develop real-time services, collaborating with partner engineering and product teams. The ideal candidate is open-minded, proactive, self-motivated, and organized. We offer a competitive salary, flexible working hours, a remote work option, and various benefits. This role requires extensive experience in software development, cloud platforms, and distributed systems. You will be responsible for leading architecture, building systems, and ensuring high performance and security.

Requirements

• 12+ years of professional software development experience, with deep expertise in Java and/or Go (both preferred)
• Hands-on experience with a major cloud platform (GCP, AWS, or Azure) for designing and operating production workloads
• Proven track record of delivering large-scale, high-performance, and reliable systems
• Expertise in RESTful API design and scaling, including data modeling, error handling, performance optimization, and security best practices
• Strong background in distributed systems, Kubernetes, and containerized services
• Experience leading architecture and technical direction across multiple teams or product areas
• Strong problem-solving skills, with the ability to anticipate and address scalability, reliability, and privacy challenges
• Excellent collaboration and communication skills, with success working closely with product, partner engineering, and cross-functional stakeholders
• Proven ability to mentor senior engineers and raise technical standards across an organization

Responsibilities

• Lead the architecture and technical vision for platform integrations, ensuring high performance, security, and scalability
• Design and build systems that enable partners to connect and operate real-time services efficiently and securely
• Work with partner engineering and product teams to plan, build, and launch integrations that meet business and technical goals
• Deliver critical platform features from design through implementation, testing, rollout, and adoption
• Identify and address technical debt, performance bottlenecks, and scalability risks before they impact customers
• Champion architectural patterns and platform capabilities that improve developer velocity and operational reliability
• Promote engineering excellence through constructive code reviews, mentoring, and driving improvements in code quality, architecture, and platform best practices

Preferred Qualifications

• Experience designing real-time, low-latency, large-scale data processing systems
• Knowledge of programmatic advertising or other high-throughput transactional platforms
• Familiarity with CI/CD pipelines, infrastructure as code (Terraform, Helm), and advanced monitoring/observability tools (e.g. Grafana)
• Proven ability to introduce architectural patterns that improve developer velocity and system reliability
• Experience using AI-assisted development tools to enhance productivity

Benefits

• Annual performance bonus
• Tax-deductible system due to copyright protection: 75%
• Private health care for you and your family (covered by OpenX)
• Private life and travel insurance
• MultiKafeteria program
• Training: access to the LinkedIn learning platform and Tech workshops
• Holiday Allowance
• Pension scheme (PPK from PZU)
• Additional paid day off
• Free parking lot
• Access to peer to peer recognition platform
• Monthly work-from-home allowance and one-time payment when you join us to help you set up your home office
• We celebrate team members' important personal milestones (vouchers, gifts)
• Flexible working hours & remote work option